When a remote VPN server connects to a host VPN server it publishes its local routes to the host server. These are then re-published by the host server to the local LAN using RIP. These RIP announcements are used by other machines on the LAN to learn the necessary routes to access the remote machines across the VPN.

RIP updates are sent out only periodically - the RIP update frequency is a random number between 25 and 40 seconds, as recommended by the RIP specification. So there can be a delay before RIP broadcasts are made after connection, dependent on where in the cycle the RIP manager is on the Server.

Because of this delay in the RIP broadcasts, machines can show up as not accessible when they have simply not yet learned the routes for the VPN. A retest after a short while normally shows the correct status.

If you have any questions about this article please contact Qbik Support.